CN109301798A - The soft lineal system traveling-wave protection method of one kind, lightning stroke interference judgment method and device - Google Patents
The soft lineal system traveling-wave protection method of one kind, lightning stroke interference judgment method and device Download PDFInfo
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- CN109301798A CN109301798A CN201810997280.6A CN201810997280A CN109301798A CN 109301798 A CN109301798 A CN 109301798A CN 201810997280 A CN201810997280 A CN 201810997280A CN 109301798 A CN109301798 A CN 109301798A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/265—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured making use of travelling wave theory
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention provides a kind of soft lineal system traveling-wave protection method, lightning stroke interference judgment method and devices, acquire the voltage signal of flexible HVDC transmission system, and voltage signal progress S-transformation is obtained the multiple time-frequency matrix of two dimension；The amplitude of each sampled point in setpoint frequency section is extracted according to the multiple time-frequency matrix of two dimension; judge the variation tendency of the amplitude of sampled point in setpoint frequency section; if amplitude variation tendency meets the condition of setting; it is judged as that lightning stroke interference occurs for flexible HVDC transmission system route; otherwise it is judged as flexible HVDC transmission system line failure, the movement of traveling-wave protection at this time outlet.Calculation amount is small, time-consuming is short, calculating process is simple, improve DC transmission system traveling wave fault judging efficiency, failure can quickly be cut off, equipment damage caused by feeder line fault can be greatly reduced, reduce the impact of AC network, reduce grid power blackout loss, effectively prevent a power grid unstability and caused by large-scale blackout, and then improve the reliability of DC grid.
Description
Technical field
The invention belongs to direct current transportation technical field of relay protection, in particular to a kind of soft lineal system traveling-wave protection method,
Lightning stroke interference judgment method and device.
Background technique
With the development of power electronics technology, flexible HVDC transmission system has been continuously available new breakthrough on this basis.
Flexible DC transmission technology is considered as the developing direction of future electrical energy transmission, and relative to ac transmission system, direct current system is steady
Qualitative height, transmission loss is small, the realization of development and high voltage DC breaker in particular with high-voltage large-capacity power device,
DC grid has had been provided with the technical foundation of substitution AC network, and flexible DC transmission is asked since there is no commutation failure
Topic, and voltage harmonic content is few, output frequency and voltage stabilization, can quickly adjust active power and reactive power, control is flexible
Property it is good, Traditional DC transmission of electricity can be substituted to a certain extent and carry out extensive remote power transmission, renewable energy is can also be achieved, take out
The energy between energy storage and load such as storage flexibly interacts, and realizes the access of extensive clean energy resource, collects and convey, and has wide
Application prospect.The especially reversion of its trend and DC voltage the characteristics of remaining unchanged, make its be easy to be built into multiterminal element it is defeated
Electric system forms flexible direct current power grid, realize multiple feed and more drop points by electricity, thus for guarantee system global stability and
Tide optimization configuration provides good technology realization rate.Flexible DC transmission guarantees as HVDC Transmission Technology of new generation
The normal operation of flexible DC transmission is particularly important, but in the greatly developing of D.C. high voltage transmission, DC power transmission line can
It is received more and more attention by property problem.Compared with AC system guard method, the short-circuit protection method of DC line is also not
It is perfect to the greatest extent.
Non- power frequency transient state abundant point is usually contained after flexible DC transmission line failure, in voltage and current
Amount, and fault component is with the different fault condition such as fault moment, abort situation, transition resistance and system conditions
Change and changes.Therefore, fault transient signals are effectively analyzed, and extract corresponding fault characteristic information, for system protection
Quick acting, the quick positioning of the accurately identifying of fault type, fault point have great importance.Application publication number is
The Chinese invention patent application file of " CN108199357A ", entitled " a kind of method of DC transmission system traveling-wave protection " mention
A kind of protection scheme is gone out, the scheme needs of the patent calculate a large amount of data, and time-consuming for calculating, and calculating process is multiple
It is miscellaneous, the efficiency of DC transmission system breakdown judge is influenced, flexible HVDC transmission system operating status cannot be obtained in real time.
Summary of the invention
The purpose of the present invention is to provide a kind of soft lineal system traveling-wave protection method, lightning strokes to interfere judgment method and device,
For solving the problems, such as flexible HVDC transmission system breakdown judge low efficiency in the prior art.
To achieve the above object, the present invention provides a kind of flexible HVDC transmission system traveling-wave protection method, including it is as follows
Step:
1) voltage signal or current signal for acquiring flexible HVDC transmission system, by the voltage signal or current signal into
Row S-transformation obtains the corresponding multiple time-frequency matrix of two dimension；
2) amplitude that each sampled point in setpoint frequency section is extracted according to the multiple time-frequency matrix of the two dimension, judges setpoint frequency section
The variation tendency of the amplitude of interior sampled point is judged as flexible HVDC transmission system if amplitude variation tendency meets the condition of setting
Lightning stroke interference occurs for route, if amplitude variation tendency is unsatisfactory for the condition of setting, is judged as that flexible HVDC transmission system route is sent out
Raw failure, the movement of traveling-wave protection at this time outlet.
It, need to be according to the current signal before carrying out S-transformation to the voltage signal in order to improve outlet efficiency of movement
Judge whether DC power transmission line occurs troubles inside the sample space, if troubles inside the sample space occurs for judgement, S change is carried out to the voltage signal
It changes.The only just progress S-transformation processing when troubles inside the sample space occurs, it is therefore prevented that the case where external area error malfunction occurs.
It is further limited as to setpoint frequency, the setpoint frequency section is [20Hz, 200Hz].
It is struck by lightning the present invention also provides a kind of flexible HVDC transmission system and interferes judgment method, include the following steps:
(1) voltage signal and current signal for acquiring flexible HVDC transmission system obtain voltage signal progress S-transformation
Time-frequency matrix is answered to a two dimension；
(2) amplitude that each sampled point in setpoint frequency section is extracted according to the multiple time-frequency matrix of the two dimension, judges setpoint frequency
The variation tendency of the amplitude of sampled point is judged as flexible DC transmission system if amplitude variation tendency meets the condition of setting in section
Lightning stroke interference occurs for route of uniting.
It, need to be according to the current signal before carrying out S-transformation to the voltage signal in order to improve outlet efficiency of movement
Judge whether DC power transmission line occurs troubles inside the sample space, if troubles inside the sample space occurs for judgement, S change is carried out to the voltage signal
It changes.The only just progress S-transformation processing when troubles inside the sample space occurs, it is therefore prevented that the case where external area error malfunction occurs.
It is further limited as to setpoint frequency, the setpoint frequency section is [20Hz, 200Hz].
The present invention also provides a kind of flexible HVDC transmission system traveling-wave protection device, including memory, processor and
The computer program that can be run on a memory and on a processor is stored, the processor is realized following when executing described program
Step:
1) voltage signal for acquiring flexible HVDC transmission system, when voltage signal progress S-transformation is obtained two dimension again
Frequency matrix；
2) the corresponding amplitude of each frequency is extracted according to the multiple time-frequency matrix of two dimension, judge the corresponding amplitude of side frequency it
Between difference and given threshold relationship, if the difference be more than or equal to given threshold, be judged as flexible HVDC transmission system line
Road occurs lightning stroke interference and is judged as flexible HVDC transmission system line failure, traveling wave if the difference is less than given threshold
Protection act outlet.
The present invention also provides a kind of flexible HVDC transmission system lightning stroke interference judging devices, including memory, processor
And the computer program that can be run on a memory and on a processor is stored, the processor is realized when executing described program
Following steps:
(1) voltage signal for acquiring flexible HVDC transmission system, when voltage signal progress S-transformation is obtained two dimension again
Frequency matrix；
(2) the corresponding amplitude of each frequency is extracted according to the multiple time-frequency matrix of the two dimension, judges the corresponding amplitude of side frequency
Between difference and given threshold relationship, if the difference be more than or equal to given threshold, be judged as flexible HVDC transmission system
Lightning stroke interference occurs for route.
The beneficial effects of the present invention are:
Method calculation amount provided by the invention is small, time-consuming is short, calculating process is simple, improves the event of DC transmission system traveling wave
Hinder judging efficiency, can quickly cut off failure, equipment damage caused by feeder line fault can be greatly reduced, reduces alternating current
The impact of net reduces grid power blackout loss, effectively prevent a power grid unstability and caused by large-scale blackout, and then improve straight
The reliability of galvanic electricity net.Method of the invention ensure that external area error will not malfunction, ensure that the precision maneuver of troubles inside the sample space,
Avoid traveling-wave protection malfunction due to line mutual-inductance.
Detailed description of the invention
Fig. 1 is the traveling-wave protection method flow chart of flexible HVDC transmission system of the invention；
Fig. 2 is the magnitude extraction flow chart in the present invention under each frequency characteristic.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing:
The embodiment of flexible HVDC transmission system traveling-wave protection method
The present invention provides a kind of flexible HVDC transmission system traveling-wave protection methods, pass through acquisition flexible DC transmission first
Voltage signal progress S-transformation is obtained a two dimension and answers time-frequency matrix by the voltage signal and current signal of system；Then according to two
The amplitude that multiple time-frequency matrix extracts each sampled point in setpoint frequency section is tieed up, judges the variation of the amplitude of sampled point in setpoint frequency section
Trend is judged as that lightning stroke interference occurs for flexible HVDC transmission system route, if width if amplitude variation tendency meets the condition of setting
Value variation tendency is unsatisfactory for the condition of setting, is judged as flexible HVDC transmission system line failure, and traveling-wave protection at this time is dynamic
For export.
The problems such as being belonged to long-distance sand transport signal due to high voltage power transmission, considered pressure drop, line loss, current signal is anti-interference
Ability is strong, is less susceptible to faults feature, comprehensively considers, and voltage signal can more show the spy of fault traveling wave after breaking down
Sign.Therefore, the present embodiment mainly studies influence of the voltage signal to fault traveling wave.Specifically, as shown in Figure 1, the present embodiment
Flexible HVDC transmission system traveling-wave protection method the step of are as follows:
(1) voltage signal u (t), the current signal i (t) for acquiring DC transmission system carry out S change to voltage signal u (t)
It changes, obtains the multiple time-frequency matrix of two dimension.
(2) judge whether flexible HVDC transmission system has occurred troubles inside the sample space according to the variation of current signal i (t), if sentencing
Troubles inside the sample space has occurred, then solution amplitude is carried out to the element in the multiple time-frequency matrix of two dimension.The multiple time-frequency matrix of two dimension is expressed as S
[R, C], wherein R indicates row vector, and C indicates column vector, and row vector R represents the time domain specification of a certain characteristic frequency, column vector C
The amplitude-frequency characteristic that the signal at a certain moment changes over time is represented, element is a plural number in matrix, can extract a certain moment
The amplitude and phase information of a certain characteristic frequency.Specifically, the amplitude to matrix S [R, C] every row element is summed, it is set as A (n),
The amplitude of the discrete Fourier transform of signal under the characteristic frequency is represented, as shown in Figure 2.The actual frequency values f (n) of each point
=(fs/N) * n, wherein fs is sample frequency, and N is sampling number, and n is sample frequency.
When direct current line of flexible direct current power transmission by lightning stroke interference when, frequency 100HZ low frequency component below very
It is weak, and the component that frequency concentrates on frequency band [100Hz, 600Hz] is very big, the fault signature in [200Hz, 600Hz] frequency range
Variation tendency is less obvious, and with the increase of n, the amplitude variation tendency of the range property frequency is first increases and then decreases.Instead
Route occur metallic ground short circuit and lightning stroke ground fault when, frequency accounts for leading role in 200HZ low frequency component below, and
For frequency in the high fdrequency component meeting very little of 200HZ or more, which is gradually smaller；I.e. in frequency
The amplitude of rate section [100Hz, 200Hz] is all very high, lightning stroke interference and ground fault in this section of frequency band of [100Hz, 200Hz] component
The variation tendency of both (including metallic ground failure and lightning stroke ground short circuit failure) fault traveling wave frequency spectrum has apparent rule.
(3) therefore, the present embodiment has chosen lightning stroke interference and ground fault content is all very high, and has obvious fault characteristic area
The frequency range divided, i.e., [20Hz, 200Hz], which corresponds to above-mentioned setpoint frequency section.Judge sampled point in setpoint frequency section
Relationship between the trend of amplitude variation and the condition of setting is judged as flexible when the condition of amplitude variation tendency satisfaction setting
DC transmission system route occurs lightning stroke interference and is judged as that flexible direct current is defeated if amplitude variation tendency is unsatisfactory for the condition of setting
Electric system line failure, the movement of traveling-wave protection at this time outlet.The present embodiment judges width using the amplitude of neighbouring sample point
It is worth variation tendency, adjacent sampled point can judge amplitude variation tendency substantially, that is, judge that the frequency of neighbouring sample point is corresponding
Whether the difference between amplitude meets the condition of setting, and the setting condition of the present embodiment refers to occurring the threshold value of lightning stroke interference.
Difference between the corresponding amplitude of the frequency of neighbouring sample point is expressed as A (n)-A (n-1), and the threshold value that lightning stroke interference occurs indicates
For KsetA if (n)-A (n-1) >=Kset, n value is in [20Hz, 200Hz]；Judge that flexible HVDC transmission system route is struck by lightning
Interference, if A (n)-A (n-1) < Kset, it is judged as flexible HVDC transmission system line failure, traveling-wave protection movement outlet.
In addition, the present embodiment calculates route pole wave also according to voltage signal u (t), current signal i (t) and surge impedance of a line.
Failure pole is screened according to route pole wave change rate, when route pole wave change rate is timing, positive line failure, when route pole
When wave change rate is negative, anode circuit breaks down.
The present invention carries out S-transformation to the voltage signal of acquisition first, then obtains a two dimension and answers time-frequency matrix, according to
To two dimension answer time-frequency matrix norm value characteristic judge flexible HVDC transmission system be occur lightning stroke interference or line fault, so
The lightning stroke interference or line fault of flexible HVDC transmission system are further judged in conjunction with the change rate of pole wave afterwards, is acted in area
Reliably, quick-action is high, can avoid malfunction caused by line mutual-inductance, from failure is detected to protection exit, can achieve 3ms with
It is interior, it can satisfy the demand of flexible DC transmission route ultra- high speed protection 3ms.
The embodiment of flexible HVDC transmission system lightning stroke interference judgment method
It is struck by lightning the present invention also provides a kind of flexible HVDC transmission system and interferes judgment method, due to judging that flexible direct current is defeated
The specific method whether electric system occurs lightning stroke interference is described in detail in the above-described embodiments, therefore, at this
In repeat no more.
The embodiment of flexible HVDC transmission system traveling-wave protection device
Protective device in the present embodiment include memory, processor and storage on a memory and can be on a processor
The computer program of operation, processor realize flexible HVDC transmission system traveling-wave protection method of the invention when executing program, should
Method is described in detail in the embodiment of flexible HVDC transmission system traveling-wave protection method, and which is not described herein again.
The embodiment of flexible HVDC transmission system lightning stroke interference judging device
Judgment means in the present embodiment include memory, processor and storage on a memory and can be on a processor
The computer program of operation, processor realize flexible HVDC transmission system lightning stroke interference judgement side of the invention when executing program
Method, this method are described in detail in the embodiment that flexible HVDC transmission system is struck by lightning interference judgment method, here not
It repeats again.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, introduction according to the present invention is designed each
The model of kind deformation, formula, parameter do not need to spend creative work.The case where not departing from the principle and spirit of the invention
Under to embodiment carry out variation, modification, replacement and deformation still fall in protection scope of the present invention.
Claims (8)
1. a kind of flexible HVDC transmission system traveling-wave protection method, which comprises the steps of:
1) voltage signal progress S-transformation is obtained one by the voltage signal and current signal for acquiring flexible HVDC transmission system
A multiple time-frequency matrix of two dimension；
2) amplitude that each sampled point in setpoint frequency section is extracted according to the multiple time-frequency matrix of the two dimension, judges to adopt in setpoint frequency section
The variation tendency of the amplitude of sampling point is judged as flexible HVDC transmission system route if amplitude variation tendency meets the condition of setting
Generation lightning stroke interference is judged as that event occurs for flexible HVDC transmission system route if amplitude variation tendency is unsatisfactory for the condition of setting
Barrier, the movement of traveling-wave protection at this time outlet.
2. flexible HVDC transmission system traveling-wave protection method according to claim 1, which is characterized in that the voltage
Before signal carries out S-transformation, it need to judge whether DC power transmission line occurs troubles inside the sample space according to the current signal, if judgement hair
Raw troubles inside the sample space, then carry out S-transformation to the voltage signal.
3. flexible HVDC transmission system traveling-wave protection method according to claim 1 or 2, which is characterized in that the setting
Frequency band is [20Hz, 200Hz].
4. a kind of flexible HVDC transmission system lightning stroke interference judgment method, which comprises the steps of:
(1) voltage signal progress S-transformation is obtained one by the voltage signal and current signal for acquiring flexible HVDC transmission system
A multiple time-frequency matrix of two dimension；
(2) amplitude that each sampled point in setpoint frequency section is extracted according to the multiple time-frequency matrix of the two dimension, judges in setpoint frequency section
The variation tendency of the amplitude of sampled point is judged as flexible HVDC transmission system line if amplitude variation tendency meets the condition of setting
Lightning stroke interference occurs for road.
5. flexible HVDC transmission system lightning stroke interference judgment method according to claim 4, which is characterized in that described
Before voltage signal carries out S-transformation, it need to judge whether DC power transmission line occurs troubles inside the sample space according to the current signal, if sentencing
It is disconnected that troubles inside the sample space occurs, then S-transformation is carried out to the voltage signal.
6. flexible HVDC transmission system lightning stroke interference judgment method according to claim 4 or 5, which is characterized in that described
Setpoint frequency section is [20Hz, 200Hz].
7. a kind of flexible HVDC transmission system traveling-wave protection device, including memory, processor and storage are on a memory simultaneously
The computer program that can be run on a processor, which is characterized in that the processor performs the steps of when executing described program
1) voltage signal progress S-transformation is obtained the multiple time-frequency square of two dimension by the voltage signal for acquiring flexible HVDC transmission system
Battle array；
2) the corresponding amplitude of each frequency is extracted according to the multiple time-frequency matrix of the two dimension, judged between the corresponding amplitude of side frequency
The relationship of difference and given threshold is judged as that flexible HVDC transmission system route is sent out if the difference is more than or equal to given threshold
Raw lightning stroke interference is judged as flexible HVDC transmission system line failure, traveling-wave protection if the difference is less than given threshold
Movement outlet.
The interference judging device 8. a kind of flexible HVDC transmission system is struck by lightning, including memory, processor and it is stored in memory
Computer program that is upper and can running on a processor, which is characterized in that the processor is realized following when executing described program
Step:
(1) voltage signal progress S-transformation is obtained the multiple time-frequency square of two dimension by the voltage signal for acquiring flexible HVDC transmission system
Battle array；
(2) the corresponding amplitude of each frequency is extracted according to the multiple time-frequency matrix of the two dimension, judged between the corresponding amplitude of side frequency
Difference and given threshold relationship, if the difference be more than or equal to given threshold, be judged as flexible HVDC transmission system route
Lightning stroke interference occurs.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810997280.6A CN109301798B (en) | 2018-08-29 | 2018-08-29 | Traveling wave protection method and lightning stroke interference judgment method and device for flexible-straight system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810997280.6A CN109301798B (en) | 2018-08-29 | 2018-08-29 | Traveling wave protection method and lightning stroke interference judgment method and device for flexible-straight system |
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| CN109301798A true CN109301798A (en) | 2019-02-01 |
| CN109301798B CN109301798B (en) | 2020-07-17 |
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| CN112345885A (en) * | 2020-11-05 | 2021-02-09 | 国网江苏省电力有限公司盐城供电分公司 | Fault detection method for high-voltage direct-current transmission line |
| CN113659574A (en) * | 2021-08-25 | 2021-11-16 | 王文林 | Closed-loop and open-loop simulation platform and simulation method for power distribution network with phase angle difference |
| CN114069685A (en) * | 2021-11-22 | 2022-02-18 | 国网安徽省电力有限公司电力科学研究院 | Method for inhibiting commutation failure caused by lightning shielding failure direct current line |
| CN116953425A (en) * | 2023-07-03 | 2023-10-27 | 国网四川省电力公司成都供电公司 | Power transmission cable metal sheath grounding fault positioning method based on fixed frequency alternating current coupling |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112086940A (en) * | 2020-08-21 | 2020-12-15 | 许继集团有限公司 | Rapid traveling wave protection method and device for flexible direct current transmission line |
| CN112345885A (en) * | 2020-11-05 | 2021-02-09 | 国网江苏省电力有限公司盐城供电分公司 | Fault detection method for high-voltage direct-current transmission line |
| CN113659574A (en) * | 2021-08-25 | 2021-11-16 | 王文林 | Closed-loop and open-loop simulation platform and simulation method for power distribution network with phase angle difference |
| CN113659574B (en) * | 2021-08-25 | 2023-11-21 | 王文林 | Power distribution network closed-loop simulation platform with phase angle difference and simulation method |
| CN114069685A (en) * | 2021-11-22 | 2022-02-18 | 国网安徽省电力有限公司电力科学研究院 | Method for inhibiting commutation failure caused by lightning shielding failure direct current line |
| CN114069685B (en) * | 2021-11-22 | 2023-08-25 | 国网安徽省电力有限公司电力科学研究院 | Method for inhibiting commutation failure caused by lightning shielding failure direct current circuit |
| CN116953425A (en) * | 2023-07-03 | 2023-10-27 | 国网四川省电力公司成都供电公司 | Power transmission cable metal sheath grounding fault positioning method based on fixed frequency alternating current coupling |
| CN116953425B (en) * | 2023-07-03 | 2024-02-09 | 国网四川省电力公司成都供电公司 | Power transmission cable metal sheath grounding fault positioning method based on fixed frequency alternating current coupling |
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| CN109301798B (en) | 2020-07-17 |
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